Paralleling device



L1. WEINSTN. PARALLEUNG DEVICE.

APFLICATKON FILED IAN-6.1920.

Patented July 6, 1920.

2 SHEETS-SHEET l.

L. l. WEINSTEIN.

PARALLELING DEVICE.

APPLicATIoN FILED 1AN.6,1920.

1,345,815. Patemedluly 6,1920.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.'

LOUIS J. WEINS'IEIN, OF NEW YORK, N. Y.

PARALLELING DEVICE.

To all 'wlmi/t t may concern:

'lle it known that l, Louis J. lWnINs'rnIN, a citizen ot' the UnitedStates, residing at New `York, in the county of New York and btate ofNew York, have invented certain new and useful improvements inFaralleling Devices, of which the following is a specification. Y

The invention relates to devices applicable in the dental art forparalleling tooth surfaces, tooth cavities, root canals and particularly:tor paralleling abutments for bridges oit' either tho removable orfined type. rllhose skilled in the dental art will readily recognize thenecessity tor such a device in paralleling the abutments of dentalbridges ot' the split pin and tube type, particularly when the naturalteeth utilized for the abutments are relatively inclined to such degreeas to prevent accurate positioning oi' the tube, for example, so thatthe dummy7 or removable portion ot the bridge may be inserted andremoved without diiiiculty.

An exemplary construction ott the new appliance is shown on the drawing,in whieh- Figure 1 is a plan view showing an enr bodiment ot theappliance as used in paralleling the abutments oi' a complete denturei'or the lower jaw, the natural teeth utilized as abutments being acentral, cuspid and third molar on one side and a cuspid and secondbicuspid on the other, a saddle being' shown as attached to the latterabutment.

Fig. 2 is a lateral elevation or' Fig. l, seen 'from the right (onecuspid not shown).

Fig. 3 is an elevation oi' one form oi the appliance, that of Fig. 9.

Fig. ll is a vertical section through of Fig. 1.

Fig. 5 is a horizontal section on i/-g/ ot Fig. 3.

Figs. 6, 7, 8 and 9 show various forms of the arcuate base plate.

Referring to the figures, 10 is an arcuate supporting plate, thecurvature oi' which may be any desired; for example, it may have theapproximate 'form ot the dental arch, as in Fig. 1, wherein the ends otthe plate come rather within than over the dental arch, or it mayconform more closely to the shape of the dental arch, as in Fig. 6; orit may have the form oi only a part of the dental arch, as in Figs. 7, 8and 9, in which the embodiment of Figs. 7 and 8 may be used forparalleling the abutments of a bridge located on one side only of thejaw;

Specification of Letters Patent.

Patented July 6, 1920.

and that of Fig. S) may serve for paralleling anterior teeth utilized asabutments.

.arcuate plate 10 is provided with a series ot adjacent perforations orother equivalent arrangements 11 ior the reception or' screw clamps 12.A screw clamp 12 consists of a post 13 inserted in an opening 1l, washer11i and spiral spring 15 superposed respectively on post 13 above plate10, and screw cap 12a engaging the threaded upper end oi post 13. rllhelatter is provided at the lower end with a non-circular, tor examplerectangular, slot 16 for the reception ot a bar 17 iitting slidablytherein, adjustable longitudinally and retained in adjusted position bymeans of the screw cap 12a. Bar 17 isV provided with a longitudinal borefor the reception of a pin 18, one end of which is threaded for theengagement oli' a screw cap 19, and having at the other end an openingfor the reception of a paralleling pin 20, which is longitudinallyadjustable therein and held in position by movement of screw cap 19.Screw caps 122L and 19 are provided with slots for the reception of akey orthe like, or are knurled to aid in manipulation. Bar 17 isperforated near the inner end with a longitudinal slot for'the receptionof a lug 21 provided on pin 18 and preventing rotary movement of thelatter. A notch 22 is cut in the ends ot' bar 17 and aids in retentionot' paralleling pin 20.

With this appliance the operator may position the tree ends of two,three or more paralleling pins 2O in as many abutments, for example, inroot canals of teeth or in tubes and the like attached to crowns, inlaysor similar attachments, so as to have all the pins and tubes parallelwith respect to each other. Fig. l shows the appliance used forparalleling the attachments of five teeth utilized as abutinents for acomplete denture, a saddle 23 being shown by way of illustration asattached to bridge. In this ligure arcuate plate 10 is given a hairpincurve, the ends lying rather inside than exactly over the dental arch;in this form the posterior abutments can be paralleled by manipulatingbars 17, and therewith paralleling pins 20, from within the dental arch,which is of .decided advantage when working in a small oral cavity.

The ends of paralleling pins 2O to be insorted in the abutment tube,cavity or the like may vary in size corresponding to that of the tube ordrill used by the operator.

The entire appliance may be placed in the oral cavity, the abutmentsadjusted there- With and the Whole removed with the impression; or, pins2O may be released from the remainder of the device, which latter isremoved from the mouth leaving the pins in the abutments. The impressionmay then be taken with the pins in position, tubes 24k (FigT 2 in dottedlilies) havingbeen placed previously over the pins if it is desired thatthese remain in the abutments; when the model is poured and the Wholeset up on the articular or other similar device, the pins and abutmenttubes will appear in proper relative positions thereon.

The construction described herein andV shown on the drawings issubstantially that of my invention, but the latter is not limitedthereto nor to the exact method of application disclosed. For example,pins 2O may vbe tubular and serve to parallel pins which are lo bepermanently positioned in abutment teeth. rI'hese paralleling pins ortubes, ordinarily of the same material as the remainder of the device,for example, steel, may be of material suitable for permanent attachmentin the abutment, for example, gold, platinum, palladium, or alloysthereof, in which case they may be positioned in the abutmentpermanently, `for example, cemented therein, after being paralleled andbefore removal from the remainder of the device.

Instead of adjacent perforations 11, arcuate plate l0 may be providedwith successively positioned longitudinal slots, Vor with onelongitudinal slot extending fron) one end to the other thereof, in whichbars 17 may be adjusted.

As stated above, any number of abutments may be paralleled, the numberthereof being limited only by the number of teeth retained and utilizedas abutments for the artificial denture.

I claim:

l. In a dental paralleling device, an arcuate base plate, arms rotatablyand slidably supported thereon and paralleling elements adjustable insaid arms at an angle thereto.

2. In a dental paralleling device,a curved base plate a portion of whichconforms to the shape of the anterior portion of the dental arch and theends of which lie Within the posterior portions of the dental arch, armsrotatably and slidably supported on said base plate and parallelingelements adjustable in said arms at an angle thereto.

3. In a dental paralleling device, a perforated base plate curved toconform to the dental arch, rotatable clamping elements mount/odin theperforations of said curved plate, hollow bars longitudinally slidableand adjustable in said clamping' elements, p u'foi'ated pins'slidablyadjustable in said hollow bars and paralleling elements removably andadjustably attached in the perforations of said pins.

ll. In a dental paralleling device, a perforated base plate curved toconform to a part of the dental arch, rotatable clamping` elementsmounted in the perforations of said curved plate, hollow barslongitudinally slidable and adjustable in said clamping elements,perforated pins slidably adjustable in said hollow bars and parallelingelements removably and adj ustably attached in the perforations of saidpins.

In testimony whereof I alfiX my signature.

Louis J. vvni'NsrniN.

